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<html lang="en">
<head>
  <meta charset="UTF-8">
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  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
</head>
<body>
  <script>
    // var arr=[0,1,2,3,4,5,6,7,8,9,"a","b","c","d","e","f"];
    //         var str ="";
    //         function color(){
    //             for(var i=0;i<6;i++){
    //                 var index=parseInt(Math.random()*arr.length);
    //                 str+=arr[index];
    //             }
    //            str="#"+str;
    //            return str;
    //         }
    //         console.log(color());
    function array(a){
      return '#'+Math.random().toString(16).substr(2,6)
    }
    console.log(array());
  </script>
</body>
</html>